better error handling when submitting tx

html/js/controllers/send_coins.js

@@ -179,6 +179,13 @@ class HostedMoneroAPIClient
         self.$http.post(config.apiUrl + endpointPath, parameters).then(
             function(data)
             {
+                if (data.data.error)
+                {
+                    const errStr = "Invalid mixin - must be >= 0";
+                    const err = new Error(data.data.error);
+                    fn(err);
+                    return;
+                }
                 __proceedTo_parseAndCallBack(data.data)
             }
         ).catch(

src/YourMoneroRequests.cpp

@@ -910,6 +910,9 @@ YourMoneroRequests::submit_raw_tx(
     {
         j_response["status"] = "error";
         j_response["error"]  = "Tx faild parse_hexstr_to_binbuff";
+
+        OMERROR << j_response["error"];
+
         session_close(session, j_response.dump());
         return;
     }
@@ -920,6 +923,9 @@ YourMoneroRequests::submit_raw_tx(
     {
         j_response["status"] = "error";
         j_response["error"]  = "Tx faild parse_and_validate_tx_from_blob";
+
+        OMERROR << j_response["error"];
+
         session_close(session, j_response.dump());
         return;
     }
@@ -931,6 +937,9 @@ YourMoneroRequests::submit_raw_tx(
                                "in the mempool. "
                                "Please wait till your previous tx(s) "
                                "get mined";
+
+        OMERROR << j_response["error"];
+
         session_close(session, j_response.dump());
         return;
     }
@@ -941,6 +950,9 @@ YourMoneroRequests::submit_raw_tx(
     {
         j_response["status"] = "error";
         j_response["error"]  = error_msg;
+
+        OMERROR << j_response["error"];
+
         session_close(session, j_response.dump());
         return;
     }